Tank Abandonment In Place in Salem, OR
When a buried tank sits beneath a driveway, retaining wall, or addition that cannot be cut without significant collateral damage, Oregon DEQ permits decommissioning by abandonment in place. We pump, clean, fill with inert slurry, and document the work.
Permitted under OAR 340-177-0100(2)(b) when removal would damage permanent structures · Tank pumped, cleaned, and filled with controlled low-strength material
Tank Abandonment In Place: what you need to know
Sometimes a buried tank is in a place that cannot reasonably be excavated. A 1958 ranch in Faye Wright with the tank under a 1972 concrete driveway is a candidate. So is a Sunnyslope split-level where the addition was poured directly over the tank in the 1980s. In those situations Oregon DEQ allows decommissioning by abandonment in place: a regulated alternative that closes the property file without tearing apart what is built above.
The mechanics are different from removal but the standard of evidence is similar. The tank still has to be located, pumped to dry, cleaned to vapor-free, and the steel shell either cut open at the top to vent or fully filled with an approved inert material, typically a flowable cementitious slurry that eliminates voids and prevents future collapse. Soil samples are still pulled wherever access permits, and a Decommissioning Report is still filed with DEQ.
Abandonment is not a shortcut. The work is comparable in cost to a removal because the cleaning, sampling, and reporting are identical. What you save is the structural damage, not the labor. The right time to choose abandonment is when removal would mean cutting a foundation, replacing a driveway, or losing mature landscaping that a homeowner is unwilling to disturb.
Benefits of Tank Abandonment In Place
Preserves driveways, foundations, and additions
No saw-cutting permanent slabs, no cutting back into a foundation wall, no removing a deck or addition that was built over the tank.
Same DEQ closeout as removal
The Decommissioning Report submitted to DEQ documents the abandonment-in-place work, soil sample results, and the inert fill. Lenders treat the closeout letter the same way they treat a removal closeout.
Approved fill materials only
Controlled low-strength material (CLSM) flowable fill is preferred because it self-levels, eliminates voids, and is the option most lenders ask for by name. Pea gravel or sand is used only when slurry access is genuinely impossible.
Documented justification
The report explains specifically why removal was not feasible at this property. That explanation is what lets DEQ accept the abandonment rather than insisting on excavation.
What's covered under Tank Abandonment In Place
The work that sits within tank abandonment in place for our Salem-area crews:
Under-driveway tank abandonment
Saw-cut a small access window, pump and clean through it, fill with slurry, patch the slab.
Under-addition tank abandonment
When a room addition or deck sits over the tank, we work through fill and vent pipes plus a single keyhole excavation rather than removing the structure.
Re-decommissioning of older sand-filled tanks
Pre-1990 closures are not recognized under current DEQ rules. We re-document under OAR 340-177 so the property file closes properly.
CLSM (controlled low-strength material) flowable fill
Self-leveling cement slurry. The preferred fill for abandonment because it eliminates internal voids.
Soil-sample-only documentation
For tanks abandoned by a prior owner without records, we can pull representative soil samples and produce a stand-alone documentation packet.
Lender-and-title liaison
We talk directly with the buyer's lender or title officer about the report. Abandonment in place is the part of the file most likely to draw underwriter questions.
Is Tank Abandonment In Place the right service for your situation?
Abandonment in place is the right answer when:
- A concrete driveway, sidewalk, or carport was poured over the tank and is now load-bearing access to the home.
- A room addition, garage, or deck sits directly on top of the tank and removing the tank would mean rebuilding the structure.
- Mature trees or retaining walls would have to be removed to reach the tank with an excavator.
- The tank is partially under a property line, the neighbor will not consent to access from their side, and removal from your side alone is not safe.
- A previous abandonment was done pre-1990 (sand fill, no DEQ paperwork) and a current sale requires re-decommissioning under modern rules.
How the process works
Survey & feasibility
We confirm that abandonment is the right call. Sometimes a tighter excavator or a small saw-cut makes removal cheaper than expected. The decision goes in the file.
Permit & DEQ notice
Same as a removal: Salem permit, 72-hour DEQ Notice of Intent. The notice specifies abandonment and identifies the fill material.
Pump, clean, fill
Tank is pumped, cleaned to NFPA 326 standards, and filled with CLSM slurry through the existing fill pipe and a vented tap. The tank is now structurally inert.
Sample & report
Soil samples are pulled wherever the excavation reached the tank wall. The Decommissioning Report (including photos, fill manifest, and sample results) is filed with DEQ within 60 days.
Areas we cover
Our crews handle tank abandonment in place across Salem and the surrounding Marion and Polk County area.